Rarity (and desirability) of a slant six/ factory 4 speed?

I could be wrong, lol.

The big problem with 3.09 first gears is....you pay for it when you hit 2nd gear, or some other gear, as the drop is big.

My 2015 Challenger SRT had a 6 speed with wide ratios and a 3.92 axle. You could drive anywhere with just gears 1-3-5. And 6th gear was .50 which was really snoozing.

My 2018 Challenger Hellcat has the same 6 speed, but with a close ratio set of gears and 3.70 axle. It's harder to take off from a stop light, and you need every bit of 6th gear on the highway...it's even a little steep. But, the drop between gears is very tight and it's a better driving car as a result.